| abstract |
(57) [Summary] [PROBLEMS] To improve the treatment of fly ash collected by a heat recovery means of a waste treatment device and suppress elution of harmful substances. SOLUTION: A pyrolysis furnace 1 for pyrolyzing waste, and a pyrolysis gas discharged from the pyrolysis furnace are burned, Waste treatment comprising at least a combustion and melting furnace 5 for melting non-combustible solids entrained in the pyrolysis gas, and heat recovery means 9 and 11 for recovering heat of the combustion exhaust gas discharged from the combustion and melting furnace In the apparatus, a sieve 31 for classifying fly ash sedimented in the heat recovery means, fly ash recirculation means for throwing sedimented fly ash on the sieve of the sieve into the combustion melting furnace and melting, And a chemical treating means 33 for treating a harmful substance by adding a chemical to the chemical. |